In the world of user experience (UX), it's easy to get bogged down in terminology. Terms like usability, user interface (UI), customer experience (CX), and app user experience often seem interchangeable. But what does each term really mean? Today, we'll dive into the difference between usability and app user experience.

So, what is usability?

According to ISO 9241-11:2018, usability is the extent to which a system, product, or service can be used by specified users to achieve specified goals with effectiveness, efficiency, and satisfaction in a specified context of use. In simpler terms, usability measures how easily users can complete tasks on your app or website.

Why is usability crucial?

If your app or website is too complex, users will abandon the process. Think about an e-commerce platform – if you can't find what you're looking for, you won't make a purchase. Instead, you'll go to a competitor's site that might be more user-friendly. A good app user experience prioritizes usability to keep users engaged.

How do we measure usability?

The ISO 9241-11:2018 standard outlines five metrics to gauge usability:

  • Learnability: How easy is it for users to complete basic tasks (like logging in) the first time they interact with your design?
  • Efficiency: Once users are familiar with your design, how quickly can they complete tasks?
  • Memorability: When users return to your app or website after a period of non-use, how easily do they pick up where they left off?
  • Error rate: How many errors do users make, and how easily can they recover from those mistakes (with helpful error messages, for instance)?
  • Satisfaction: How enjoyable is the user experience?

Improving usability

In our next article, we'll explore the differences between UX testing and usability testing. For now, let's focus on improving your app's usability.

The most common method? User testing! This involves observing real users as they complete tasks on your app or website. You can:

  • Engage real customers or users
  • Give them specific tasks to complete (like finding a certain item in your e-commerce catalog)
  • Observe their interactions and identify pain points
  • Use that feedback to improve your design

A brief history of usability

Did you know that usability has been an ISO standard since 1998? The ISO 9241-11:1998 standard was first published, followed by a series of revisions. In 2018, the ISO 9241-11:2018 standard was released, incorporating new systems and services.

What's the difference between usability and app user experience?

Usability focuses on achieving specific goals with effectiveness, efficiency, and satisfaction. App user experience encompasses all aspects of interaction with your product – from presentation to functionality to performance. While usability is a crucial aspect of UX, it's not the only factor.

In conclusion

By understanding the differences between usability and app user experience, you can create a more effective and enjoyable experience for your users. Whether you're an e-commerce platform or a mobile app developer, prioritizing usability is key to driving engagement and loyalty.